Every time I get into a car, I put myself in a vulnerable position. Am I to take some small bit of blame, if some speeding lunatic crashes into me?
Normally an analogy is supposed to compare like with like, I don't think the speeding driver had any intent to crash into you (unlike the intent of a rapist), now as for you putting yourself in a vulnerable position by driving a car well it is no different to anyone else who drives a car, however if you decided to drive with your eyes closed then you would be more vulnerable to someone crashing into you.